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LPC5411x
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 2.1 — 9 May 2018
86 of 105
NXP Semiconductors
LPC5411x
32-bit ARM Cortex-M4/M0+ microcontroller
13. Application information
13.1 Start-up behavior
Figure 30
shows the start-up timing after reset. The FRO 12 MHz oscillator provides the
default clock at Reset and provides a clean system clock shortly after the supply pins
reach operating voltage.
13.2 Standard I/O pin configuration
shows the possible pin modes for standard I/O pins:
•
Digital output driver: enabled/disabled.
•
Digital input: Pull-up enabled/disabled.
•
Digital input: Pull-down enabled/disabled.
Fig 30. Start-up timing
Table 41.
Typical start-up timing parameters
Parameter
Description
Value
t
a
FRO start time
20
s
t
b
Internal reset de-asserted
151
s
t
c
Legacy image
931
s
Single image without CRC
904
Dual image without CRC
952
aaa-023995
valid threshold
= 1.62 V
processor status
V
DD
FRO status
internal reset
GND
boot time
user code
boot code
execution
finishes;
user code starts
FRO
starts
supply ramp-up
time
t
b
μs
t
a
μs
t
c
μs